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Volume of a Prism
FUNCTIONS  OF  ANGLES

Engineering Aid 3 - Beginning Structural engineering guide book
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TRIGONOMETRY Our  discussion  will  focus  primarily  on  the study of plane trigonometry. It is intended only as a review of the relationships among the sides and  angles  of  plane  triangles  and  their  ratios, called   the   TRIGONOMETRIC   FUNCTIONS. The  information  presented  here  is  based  on Mathematics,  Vol.  1,   NAVEDTRA   10069-D1, chapter 19, and Mathematics, Vol. 2-A,  NAVED- TRA  10062,  chapters  3,  4,  and  6. Spherical trigonometry will be covered as you advance in rate. It is a prerequisite to the study of  navigation,  geodesy,  and  astronomy.  Hence, the   subject   of   spherical   trigonometry   will   be introduced  in  the  Engineering  Aid  class  C1  school curriculum. MEASURING   ANGLES When two straight lines intersect, an angle is formed,  You  can  also  generate  an  angle  by rotating a line having a set direction, Figure 1-19 depicts the generation of an angle. The terminal line OB is generated from the initial point OA and forms L AOB, which we will call 6 (Greek letter, pronounced   “theta”).   Angle   8  is  generally  ex- pressed  in  degrees.  The  following  paragraphs  will discuss the degree and the radian systems that are generally  used  by  Engineering  Aids. The DEGREE SYSTEM is the most common system  used  in  angular  measurement.  Angular measurement  by  REVOLUTION  is  perhaps  the unit  you  are  most  familiar  with. In the degree system, a complete revolution is  divided  into  360  equal  parts  called  degrees (360°).  Each  degree  is  divided  into  60  minutes (60´), and each minute into 60 seconds (60”). For convenience  in  trigonometric  computations,  the 360°  is  divided  into  four  parts  of  90°  each.  The 1-16







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